ESC is the abbreviation of electronic speed controller. According to different motors, it can be divided into brushed ESC and brushless ESC.
It regulates the electric motor's speed according to the control signal.
Their connection is ususally like this:
1、The ESC's input line connects with the battery;
3、The ESC's signal line connects with the receiver.
In addition, the ESC has the function of power output, namely it has a 5V output between the anode and cathode, powered up the receiver through the signal line, then the receiver can provide power to servos and other control equipment.
DJI 30A OPTO ESC